groverclevland- I didn't make a note of your link. In truth that is because I never had luck getting specific information from manufacturers about the processing elements. Yes they know if it is cotton or polyester, but not the prosessing elements. I don't have the blue dye allergy, but I do a severe allergy to an element in rubber, Mercaptobenzothiazole. It is one of 2 elements in rubber used to blend materials like poly/cotton, nylon, elastics and more. It is actually the lesser used element, yet here's the problem- the maker of the clothing has no idea what elements were used in the fabric processing. Most all fabric comes from China, gone are the days of American fabric manufactures. So even if the product is made in the USA, the material normally comes from overseas. I simply have to avoid all elastics for example while some may be safe for me. My misery is so great I don't take a chance.
I hope your blood draw will test for all metals. With my blood testing I learned I was allergic to 5 metals, yet this wasn't a test for mercury, it was a test for the metal elements in a knee replacement.
Mercury is not the only heavy metal. I think that is why the cilantro worked for me because it is a heavy metal detox.
Are you allergic to Blue Dye? This is a common allergen and most of us get exposed wearing denim.
Is your back clear enought for a 5 Day Patch Test for Blue Dye? Testing is still iffy. I've been patch tested twice with panels of about 80, yet each time the patch test showed no metal allergens. Yet the blood test showed postive allergies to 5 which I still don't have an medical explaination for the differences. Nickle is a common allergy, which I knew I had because of nickle in cheap pierced earring studs. My pieced ears will get red and swollen and turn black inside the hole. Yet gold and stainless cause no reaction. Still nickle didn't react on my patch test, yet on a scale of 1-3, I tested at a 2 or moderately allergic to nickle on the blood test. I'm assuming the blood test is more accurate.
I hope you learn something.